25637621057 has 2 divisors, whose sum is σ = 25637621058. Its totient is φ = 25637621056.

The previous prime is 25637621041. The next prime is 25637621089. The reversal of 25637621057 is 75012673652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22071262096 + 3566358961 = 148564^2 + 59719^2 .

It is a cyclic number.

It is not a de Polignac number, because 25637621057 - 2⁴ = 25637621041 is a prime.

It is a super-2 number, since 2×25637621057² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25637620999 and 25637621017.

It is not a weakly prime, because it can be changed into another prime (25637621027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818810528 + 12818810529.

It is an arithmetic number, because the mean of its divisors is an integer number (12818810529).

Almost surely, 2^25637621057 is an apocalyptic number.

It is an amenable number.

25637621057 is a deficient number, since it is larger than the sum of its proper divisors (1).

25637621057 is an equidigital number, since it uses as much as digits as its factorization.

25637621057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 25637621057 in words is "twenty-five billion, six hundred thirty-seven million, six hundred twenty-one thousand, fifty-seven".